Support indexing with any type which implmented __index__

[aisk]

Proposed changes

Any type which implemented __index__ can be used to indexing mlx array, so we can use numpy scalar to indexing array.

bool is not supported also it implemented __index__ (actually, bool is a subclass of int) because it's to quirky.

Close: #2710

Checklist

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• I have read the CONTRIBUTING document
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• I have added tests that prove my fix is effective or that my feature works
• I have updated the necessary documentation (if needed)